Detector.



c. D. BHRBT. DETECTOR.

ARPLIQIVON FILED JUPY 29, 1905.

902,569. Patented N0v. 3,1908.

auvents:

Warum v primary cell detectors. des particularly in aA iINITED STATES ATENE oEEicE.

CORNELIUS D. EIIRET, or ARDMORE rENNsYLvANIA,AssICNOR To INTERNATIONAL TELEGRAPH CONSTRUCTION COMPANY, A CORPORATIONV or' NEW YORK.

` DETECTOR.

Specification of LettesfPatent.

Patented Nome, 190e.

applicati@ nieaauiy 29,1905. serial No. 271,854.

To all whom it mayconcera: Be it known that I, CORNELIUS D. EHRET, a citizen of the United States, residing at Ardmore, county of Montgomery, and State `responsive devices for use in such systems and more especially as to improvements in TheA` invention resi two-fluid detector, one of the fluids being, preferably, a chemical depolarizer.

For an illustration of one of the forms my invention may take, reference is to be-had to the accompanying drawing, in which the `figure represents a two-fluid electro-chemical cell Or primary cell detector associated witha receiving conductor.

Between the aerial conductor Av and the V.earth E is connected the wave-responsive device or detector W consisting of a vessel .-1, preferably of insulating material containing a cellexcitant in liquid or other form.

In the cell excitant is disposed the porous earthenware cup 12 containing a material or solution, as for example chromic acid, nitric acid, potassium permanganate, manganese dioxid orthe like. In this depolarizing material is immersed the glass tube 2 having sealed therein the small conductor-'3 which is preferably ground OE flush at the lower end of the glass tube 2. 4 is the other element of the cell and is -of `a material differentlfrom the material of the conductor 3. There is formed in consequence a primary cell detector having a chemical depolarizer for amplifying its action and sensi tiveness. The. telephone receiver or other signal translating instrument T is connected directly in shunt to thev cell. The'conductoi 3 may be of platinum -while the element 4 may be of zinc, iron etc., the cell excitant being dilute sulfuric acid.

In the primary cell detector herein referred to the conductor 3 may be ofv4 platinum, carbon, tantalum, copper, steel or iron,

,or any other suitable material while the element 4 is of different material and preferably located at a distance therefrom in the electro motive force series. In `place of dilute sulfuric acid for cell excitant any other known 'cellexcit'ant may be employed as for example, caustic potash etc. If the element 3 is made of copper, it may bev employed in a copper sulfate and zinc sulfate solution to form a Daniel or gravity cell with an element 4 of zinc.I rlhe element of small ara of Contact with the liquid may be copper oxid or oxidized copper wire ina solution of caustic potash, in which case element 4 may be of iron.

What I claim is 1. A wave-responsivedevice consisting of -a two fluid primai'ycell.

2. In a wireless signaling system, receiving apparatus comprising an electro chemy ical cell as a wave responsive device, de-

polarizifng material in contact with an element of said cell, a second material in said cell, and a second element in contact with said second material. l

3. In a wireless signaling system, receive ing apparatus comprising a primary cell detector, one element of said cell being in contact with depolarizing material, a cell excitant, and a second element in contact with -said cell excitant.

4. In a wireless signaling system, receiv? ing apparatus comprising a' primary cell detector, a depolarizer, an element having relatively small area of Contact with said depolarizer, a cell excitant, and av second element in contact with said cell excitant.

5. In a wireless signaling system, receive ing apparatus comprising a primary cell detector, an elementof said cell in Contact with depolarizing material, acell excitant, a second element in contact with said cell' excitant, and means forkeeping said cell excitant anddepolarizing material from mixing.

6. In a wireless si maling system, receiv-v ing apparatus comprising a primary cell detector, an elementof said cell being in con? tact with depolarizingiluid, a second element incontact with cell excitant, and por-4 ous m'aterialforpreventing mixture of cell excitant and depolarizer.

7. In a wireless signaling system, a waveresponsive device consisting of a primary a small conductor sealed cell, an element of said cell having'relatively small area of contact with a chemical depolarzer. p x

8. In a wireless signallng` system,/receiv ing apparatus comprising an electro-chemical cell as a Wave'respons1ve device, one

element in contact with said cell excitant.

9. In a Wireless signaling system, receiving apparatus comprisin a primary cell detector, 011e element of said cell consisting of in insulating material, said insula ng material and conductor being ground oli' ush, whereby the end surface only of said conductor is exposed, a depolarizing material in contact with said exposed conductor, ond element of small conductor excitant.

l0. 11i a Wireless signaling system, receiving apparatus comprising a primary cell detector, an element of said cell consisting of a small conductor sealed inI insulating muterial, said insulating material and conductor being ground 'off Hush, whereby the end surface only of' said conductor is exposed, a depolarizing material in contact with said exposed conductor, a cell excitant, a second element in contact with said cell excitant and of a material located in the galvanic series differentlyffromv said small conductor, ,and an indicating instrument connected to t the elements of said'cell. l

CORNELIUS D. EHRET.

a cell excitant, and n. se'cmaterial other than said Witnesses: y

JAMES H. BELL, ELEANOR ROBERTS.

in contact with said cell 

